What is the best mix for topdressing a lawn?

Topdressing a lawn can improve your turf health and appeal.  Topdressing Sand is still the best material to level and topdress your lawn.  Compost has become a popular alternative because it is easy to apply and can cover a lot of area per ton.  However, most professional golf courses and sports fields still topdress with sand alone.  The method is backed with decades of turfgrass research.  Sand spreads and levels a surface easily.  Sand also increases porosity immediately within the rootzone to promote deep roots with good water and air infiltration.  Compost adds organic matter to the soil along with beneficial microbes.  However, a healthy turf may not need more organic matter as it produces its own (thatch) and it should already have an established microbial ecosystem.  The more practical side of compost application is that you end up with the larger pieces of debris (wood, peanut hulls, leaves, etc.) left on top and a portion of it blown off with the next mowing.  The issue with applying a good topsoil is that it is more difficult to spread and it may contain small rocks/pebbles that are not good for any mowers, especially reel mowers.  RSI still offers all types of sand topdressing, sand/compost topdressing blends, loamy soil topdressing, green topdressing, and sand/peat blends for topdressing.  If you have a preference let us know.